A coffee shop blends 2 kinds of coffee, putting in 2 parts of a 33p. a gm. grade to 1 part of a 24p. a gm. If the mixture is changed to 1 part of the 33p. a gm. to 2 parts of the less expensive grade, How much will the shop save in blending 100 gms.
1
Rs.9
2
Rs.1
3
Rs.3
4
Rs.5
5
None of these